Puzzles and Games
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This browser-based cryptogram solving tool has all sorts of features to help with tricky cryptograms. They have puzzles, or you can enter your own, which you can solve using their helpful interface and charts (frequency, digraphs, trigraphs, etc.)
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This isn't your playground-variety marbles game... it's more like Tetris without the time limit. Enjoy!
MIStupid.com - The Online Knowledge Magazine
This site has a collection of games, intelligence-related puzzles, and other random goodies. Enjoy!
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This site has a 2 puzzles (easy & expert) which change daily. Two $50 prizes randomly awarded daily for correctly-solved puzzles.
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Try to move the blocks around so you can get the one lined up with the exit out the door.
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The board version of this game was at Mensa Mind Games 2000.
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A 1991 Mensa Select game -- a bit challenging!